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        <a href="/2021/05/24/%E9%97%AD%E5%8C%85/">闭包</a>
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        <a href="/2021/05/24/%E9%97%AD%E5%8C%85/">
          
          
            
          
          之前对闭包只是一知半解，只是认为能引用其他作用域外的值就叫做闭包，其实不太正确
示例function foo() &#123;
	var a = 2;
	function bar() &#123;
		console.log( a );
	&#125;
	return bar;
&#125;
var baz = foo();
baz(); // 2
上面代码中，foo函数内包含一个bar函数，并且
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              <a href="/tags/Javascript/">Javascript</a>
            
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          <img src="/indexImg/%E4%BD%9C%E7%94%A8%E5%9F%9F.png" srcset="/img/loading.gif" alt="作用域">
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        <a href="/2021/05/24/%E4%BD%9C%E7%94%A8%E5%9F%9F/">作用域</a>
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        <a href="/2021/05/24/%E4%BD%9C%E7%94%A8%E5%9F%9F/">
          
          
            
          
          作用域共有两种主要的工作模型。一种是最为普遍的，被大多数编程语言所采用的词法作用域，Javascript属于这一种。另一种叫作动态作用域，仍有一些编程语言在使用（比如 Bash 脚本、Perl 中的一些模式等）。
词法作用域简单地说，词法作用域就是定义在词法阶段的作用域。换句话说，词法作用域是由你在写代码时将变量和块作用域写在哪里来决定的，因此当词法分析器处理代码时会保持作用域不变。
词法作用域最
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              2021-05-24
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              <a href="/tags/Javascript/">Javascript</a>
            
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        <a href="/2021/03/03/%E6%BB%91%E5%8A%A8%E4%B8%80%E5%AE%9A%E8%B7%9D%E7%A6%BB%E5%9B%BA%E5%AE%9Adiv/">滑动一定距离固定div</a>
      </h1>

      <p class="index-excerpt">
        <a href="/2021/03/03/%E6%BB%91%E5%8A%A8%E4%B8%80%E5%AE%9A%E8%B7%9D%E7%A6%BB%E5%9B%BA%E5%AE%9Adiv/">
          
          
            
          
          知乎和简书等一些文章阅读，右边为内容栏，左边为作者信息，作者信息会比较短，所以在滑动一段距离后，会固定实现方法如下：

获取四个数据，包括：当前窗口的高度，需要固定div的y轴距离和高度，参照div的y轴距离let windowHeight = window.innerHeight
let divHeigh = document.getElementById(&#x27;xxx&#x27;).of
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              2021-03-03
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              <a href="/tags/Javascript/">Javascript</a>
            
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        <a href="/2021/02/24/vue%E5%A4%9A%E9%A1%B5%E9%9D%A2%E7%A8%8B%E5%BA%8F%E9%85%8D%E7%BD%AE/">vue多页面程序配置</a>
      </h1>

      <p class="index-excerpt">
        <a href="/2021/02/24/vue%E5%A4%9A%E9%A1%B5%E9%9D%A2%E7%A8%8B%E5%BA%8F%E9%85%8D%E7%BD%AE/">
          
          
            
          
          最近做个vue的项目，突然想把项目中的登录页面隔离出来，配置成多页面程序，所以就搞了一下，步骤如下：
修改vue.config.js文件因为我是用vue-cli4.x配的vue项目，所以默认是没有这个文件的。不过无伤大雅，我们直接在根目录新建一个就可以。
// vue.config.js

module.exports = &#123;
  pages: &#123;
      index: &
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              2021-02-24
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              <a href="/categories/%E5%89%8D%E7%AB%AF/">前端</a>
            
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              <a href="/tags/Javascript/">Javascript</a>
            
              <a href="/tags/Vue/">Vue</a>
            
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        <a href="/2021/02/06/Express+Multer%E5%9B%BE%E7%89%87%E4%B8%8A%E4%BC%A0/" target="_blank">
          <img src="/indexImg/Express+Multer%E5%9B%BE%E7%89%87%E4%B8%8A%E4%BC%A0.jpg" srcset="/img/loading.gif" alt="Express+Multer图片上传">
        </a>
      </div>
    
    <article class="col-12 col-md-8 mx-auto index-info">
      <h1 class="index-header">
        
        <a href="/2021/02/06/Express+Multer%E5%9B%BE%E7%89%87%E4%B8%8A%E4%BC%A0/">Express+Multer图片上传</a>
      </h1>

      <p class="index-excerpt">
        <a href="/2021/02/06/Express+Multer%E5%9B%BE%E7%89%87%E4%B8%8A%E4%BC%A0/">
          
          
            
          
          项目中总会需要文件上传的功能，实现这个功能的时候，我有下面两个思路:  

将图片转为base64，再将base64码存入数据库，调用的时候直接渲染即可
将图片上传到服务器作为静态资源暴露出来，再将图片的访问链接存入数据库，调用的时候使用该链接去访问  

我们来分析一下上面两种方法:

使用base64，可以减少http请求，获取请求结果后直接编码渲染，但是也有弊端，base64一般会比原图要大
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              2021-02-06
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              <a href="/tags/Node/">Node</a>
            
              <a href="/tags/Express/">Express</a>
            
              <a href="/tags/multer/">multer</a>
            
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        <a href="/2021/01/07/Javascript%E6%B7%B1%E6%B5%85%E6%8B%B7%E8%B4%9D%E9%97%AE%E9%A2%98/">Javascript深浅拷贝问题</a>
      </h1>

      <p class="index-excerpt">
        <a href="/2021/01/07/Javascript%E6%B7%B1%E6%B5%85%E6%8B%B7%E8%B4%9D%E9%97%AE%E9%A2%98/">
          
          
            
          
          想要实现这样一个功能：进入添加数据页面，想添加一些数据，可是写到一半想退出添加数据页面，这时候数据需要回退为之前的旧数据
代码逻辑如下：
# 原数据
let info = &#123;
	name: &quot;Mike&quot;,
	age: 15
&#125;

# 更改
# 1.保存旧数据
let history = info
# 2.更改新数据
let info = &#123;
	na
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            <time datetime="2021-01-07 21:00" pubdate>
              2021-01-07
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              <a href="/categories/%E5%89%8D%E7%AB%AF/">前端</a>
            
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              <a href="/tags/Javascript/">Javascript</a>
            
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        <a href="/2020/12/05/%E6%97%A0%E7%BC%9D%E8%BD%AE%E6%92%AD%E5%9B%BE/" target="_blank">
          <img src="/indexImg/%E6%97%A0%E7%BC%9D%E8%BD%AE%E6%92%AD%E5%9B%BE.png" srcset="/img/loading.gif" alt="无缝轮播图">
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    <article class="col-12 col-md-8 mx-auto index-info">
      <h1 class="index-header">
        
        <a href="/2020/12/05/%E6%97%A0%E7%BC%9D%E8%BD%AE%E6%92%AD%E5%9B%BE/">无缝轮播图</a>
      </h1>

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        <a href="/2020/12/05/%E6%97%A0%E7%BC%9D%E8%BD%AE%E6%92%AD%E5%9B%BE/">
          
          
            
          
          轮播图原理如下：第四第五步正常来说是不能有延迟的，因为是同一张图代码如下：
HTML&lt;div id=&quot;out&quot;&gt;
	&lt;div id=&quot;imgbox&quot;&gt;
		&lt;img src=&quot;./4.jpg&quot; /&gt;
		&lt;img src=&quot;./1.jpg&quot; /&gt;
		&lt;img sr
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            <time datetime="2020-12-05 16:47" pubdate>
              2020-12-05
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              <a href="/categories/%E5%89%8D%E7%AB%AF/">前端</a>
            
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              <a href="/tags/Javascript/">Javascript</a>
            
              <a href="/tags/Html/">Html</a>
            
              <a href="/tags/Css/">Css</a>
            
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        <a href="/2020/11/29/centos%E9%83%A8%E7%BD%B2node-mongodb%E7%8E%AF%E5%A2%83/" target="_blank">
          <img src="/indexImg/centos%E9%83%A8%E7%BD%B2node-mongodb%E7%8E%AF%E5%A2%83.png" srcset="/img/loading.gif" alt="centos部署node+mongodb环境">
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      <h1 class="index-header">
        
        <a href="/2020/11/29/centos%E9%83%A8%E7%BD%B2node-mongodb%E7%8E%AF%E5%A2%83/">centos部署node+mongodb环境</a>
      </h1>

      <p class="index-excerpt">
        <a href="/2020/11/29/centos%E9%83%A8%E7%BD%B2node-mongodb%E7%8E%AF%E5%A2%83/">
          
          
            
          
          最近阿里云服务器过期了，买了其他类型的ESC，所以重新部署了一次后台，再加上上一篇讲的比较初略，所以这次详细讲讲
这次安装的东西有以下：1、node环境2、mongodb数据库3、用于命令行终端切换的screen
node环境安装首先，安装之前要选好位置，我这里是在默认目录/usr/
下载node包$ wget https://npm.taobao.org/mirrors/node/v14.13.
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            <time datetime="2020-11-29 17:06" pubdate>
              2020-11-29
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              <a href="/categories/%E5%90%8E%E5%8F%B0/">后台</a>
            
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              <a href="/tags/Node/">Node</a>
            
              <a href="/tags/Mongodb/">Mongodb</a>
            
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        <a href="/2020/11/23/Node+Express+Mongodb%E7%9A%84%E5%90%8E%E5%8F%B0%E7%B3%BB%E7%BB%9F/">Node+Express+Mongodb的后台系统</a>
      </h1>

      <p class="index-excerpt">
        <a href="/2020/11/23/Node+Express+Mongodb%E7%9A%84%E5%90%8E%E5%8F%B0%E7%B3%BB%E7%BB%9F/">
          
          
            
          
          我的一些同学觉得node做后台很奇怪，其实这个很常见。
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            <time datetime="2020-11-23 00:36" pubdate>
              2020-11-23
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        <a href="/2020/11/22/hexo%E9%83%A8%E7%BD%B2blog/">hexo部署blog(My First Blog)</a>
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          这是我的第一篇博客，整个Blog系统使用的是Hexo框架和Fluid主题，通过github和gitee的page部署的，接下来我想介绍一下我搭建的过程
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              2020-11-22
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              <a href="/categories/%E5%85%B6%E5%AE%83/">其它</a>
            
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